EP4030859B1 - Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire - Google Patents

Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire Download PDF

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Publication number
EP4030859B1
EP4030859B1 EP22159352.8A EP22159352A EP4030859B1 EP 4030859 B1 EP4030859 B1 EP 4030859B1 EP 22159352 A EP22159352 A EP 22159352A EP 4030859 B1 EP4030859 B1 EP 4030859B1
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EP
European Patent Office
Prior art keywords
candidate group
random access
base station
preamble
index
Prior art date
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EP22159352.8A
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German (de)
English (en)
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EP4030859A1 (fr
Inventor
Tomoya Ohara
Hiroki Harada
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NTT Docomo Inc
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NTT Docomo Inc
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Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Priority to PL22159352.8T priority Critical patent/PL4030859T3/pl
Priority to EP22159352.8A priority patent/EP4030859B1/fr
Priority to ES22159352T priority patent/ES2964129T3/es
Priority to EP23192929.0A priority patent/EP4258738A3/fr
Publication of EP4030859A1 publication Critical patent/EP4030859A1/fr
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Publication of EP4030859B1 publication Critical patent/EP4030859B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to user equipment, a base station, a radio communication system, and a random access method.
  • LTE Long Term Evolution
  • eNB evolved NodeB
  • the user equipment UE transmits a preamble (PRACH preamble) selected from a plurality of preambles prepared within a cell.
  • PRACH preamble a preamble
  • the base station eNB transmits an RAR (RACH response), which is the response information.
  • RAR RACH response
  • the user equipment UE that receives the RAR transmits an RRC Connection Request, as a message 3.
  • the base station eNB After receiving the message 3, the base station eNB transmits an RRC Connection Setup including cell configuration information, etc., for establishing a connection, as a message 4.
  • the user equipment UE completes the random access process and establishes a connection.
  • a channel for initially transmitting a preamble is referred to as a physical random access channel (PRACH: Physical Random Access Channel), and configuration information on the PRACH (PRACH Configuration) is signaled from the base station eNB to the user equipment UE by an index. Namely, the user equipment UE selects a PRACH resource based on the PRACH Configuration signaled from the base station eNB.
  • PRACH Physical Random Access Channel
  • the PRACH Configuration corresponds to a preamble format; and the user equipment UE transmits a preamble using a preamble format corresponding to the PRACH Configuration (cf. Non-Patent Document 1).
  • NR radio access technology
  • parameters that differ depending on a cell such as subcarrier spacing and a cyclic prefix (CP: Cyclic Prefix) length, are used, so as to effectively utilize characteristics of the various frequency bands.
  • CP Cyclic Prefix
  • optimum subcarrier spacing differs depending on a frequency band because the Doppler effect, a residual frequency offset, and so forth differ for each frequency band.
  • efficiency can be enhanced by using small subcarrier spacing for wide coverage (i.e., when the CP length is large).
  • the optimum subcarrier spacing differs depending on the assumed coverage for each frequency band.
  • the efficiency can be enhanced by using large subcarrier spacing for the PRACH.
  • the optimum subcarrier spacing differs depending on the slot size, etc., used for data communication for each frequency band.
  • an optimum symbol repetition number per preamble differs depending on the frequency band because the number of receiving beams at the base station assumed for each frequency band differs.
  • a preamble format or a PRACH Configuration is defined corresponding to the assumed plurality of types of subcarrier spacing, the assumed plurality of CP lengths, and so forth, the combinations of the parameters in the preamble format or the PRACH Configuration increase, and the overhead for signaling the preamble format or the PRACH Configuration increases.
  • An object of the present invention is to reduce an overhead for signaling a random access parameter or to reduce the testing when the random access parameter differs depending on the frequency band.
  • User equipment includes a configuration information storage that stores candidates of a preamble format or candidates of random access configuration information that are defined depending on a frequency band; a receiver that receives, from a base station, an indication of a preamble format or random access configuration information to be used for random access with the base station; and a random access controller that selects, from the configuration information storage, the candidates of the preamble format or the candidates of the random access configuration information to be used for the random access with the base station, and that starts the random access using, among the selected candidates, the preamble format or the random access configuration information corresponding to the indication.
  • the overhead for signaling the random access parameter can be reduced or the testing can be reduced.
  • LTE Long Term Evolution
  • existing technology specified in LTE can be used, as appropriate.
  • the existing technology is not limited to LTE.
  • the "LTE" used in this specification is used in broad meaning including LTE-Advanced and systems according to on and after LTE-Advanced, unless as specified otherwise.
  • the present invention can be applied to a system other than LTE to which the random access is applied.
  • FIG. 1 is a configuration diagram of the radio communication system 10 according to the embodiment.
  • the radio communication system 10 includes base stations 100; and user equipment 200.
  • a single base station 100 and a single unit of user equipment 200 are depicted; however, a plurality of base stations 100 may be provided, or a plurality of units of user equipment 200 may be provided.
  • the base station 100 may be referred to as the BS, and the user equipment 200 may be referred to as the UE.
  • the base station 100 is capable of accommodating one or more (e.g., three) cells (which may also be referred to as sectors). When the base station 100 accommodates a plurality of cells, the whole coverage of the base station 100 can be divided into a plurality of smaller areas; and, in each smaller area, a communication service can be provided by a base station subsystem (e.g., an indoor small base station RRH: Remote Radio Head).
  • a base station subsystem e.g., an indoor small base station RRH: Remote Radio Head.
  • the term “cell” or “sector” refers to a part of or the whole coverage area of the base station and/or the base station subsystem that provides the communication service in the coverage.
  • the terms "base station,” “eNB,” “cell,” and “sector” can be used interchangeably in this specification.
  • the base station 100 may also be referred to by the terms, such as a fixed station, a Node B, an eNodeB (eNB), an access point, a
  • the user equipment 200 may be referred to as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or some other suitable terms, by a person ordinarily skilled in the art.
  • the user equipment 200 is capable of communicating with the base station 100 using one or more frequency bands.
  • parameters such as subcarrier spacing, may differ depending on the frequency band.
  • the parameters that differ depending on the frequency band include one or more of, for example, the subcarrier spacing, the CP length, a preamble sequence length, a preamble sequence pattern (e.g., whether a Zadoff-Chu sequence is used or another sequence is used), a repetition number of the OFDM symbol, a repetition number of the preamble (CP + OFDM symbol), and so forth.
  • These parameters are signaled from the base station 100 to the user equipment 200 as a preamble format and/or random access configuration information (which is referred to as the PRACH Configuration).
  • the above-described parameters may be signaled in the preamble format, or may be signaled in the PRACH Configuration.
  • the preamble sequence length, the subcarrier spacing, and so forth may be signaled in the preamble format; and the other parameters may be signaled in the PRACH Configuration.
  • the PRACH Configuration may include one or more of a time/frequency resource position used for the PRACH; a resource number for each time/frequency; and spacing between resources when a plurality of time/frequency resources exists.
  • the PRACH Configuration and the preamble format may be separately signaled, or, the PRACH Configuration may include the preamble format.
  • the user equipment 200 transmits the preamble in accordance with the preamble format and/or the PRACH Configuration signaled from the base station 100.
  • FIG. 2 is a sequence diagram illustrating a random access procedure in the radio communication system according to the embodiment of the present invention.
  • Each of the base station 100 and the user equipment 200 defines candidates of the preamble format and/or candidates of the PRACH Configuration that can be used depending on the frequency band, which are to be stored as a table, for example.
  • the table may be defined, in advance, within the system based on a specification; or the table may be signaled from the base station 100 to the user equipment 200.
  • the format to be stored is not required to be a table format, and the format to be stored may be a list format in which only a part of the parameters (e.g., the subcarrier spacing) is defined depending on the frequency band. In the following, a specific example is described by exemplifying the table format.
  • each of the base station 100 and the user equipment 200 stores the candidates for the preamble format to be used in a low frequency band as a table 1, and stores the candidates for the preamble format to be used in a high frequency band as table 2.
  • the preamble format may include one or more of the subcarrier spacing; the CP length; the preamble sequence length; the preamble sequence pattern; the repetition number of the OFDM symbol; the repetition number of the preamble; and so forth. Additionally, an index indicating a pattern of the preamble format may be included.
  • the indexes for the three patterns may be provided because there are three patterns of the combinations.
  • a preamble format may be used that specifies a combination of parameters of the CP length, the repetition number of the OFDM symbol, and the subcarrier spacing, which are used in LTE.
  • the base station 100 and the user equipment 200 respectively select whether the table 1 shown in FIG. 3 is used or the table 2 shown in FIG. 3 is used (S201).
  • the selection of the table may be determined depending on the frequency band in which the user equipment 200 communicates with the base station 100; or the selection of the table may be signaled from the base station 100 to the user equipment 200 as the broadcast information, etc.
  • the UE 1 that communicates in the 4 GHz band uses the table 1
  • the UE 2 that communicates in the 28 GHz band uses the table 2.
  • different formats such as Format a and Format a', may be configured depending on the frequency band; or a same format, such as Format b, may be configured for a plurality of frequency bands.
  • the number of the tables may be optionally configured; and, for example, three or more tables may be used.
  • the correspondence between the frequency band and the table may be optionally configured.
  • three tables may be defined; the table 1 may be used for the range from 2 GHz to 10 GHz; the table 2 may be used for the range from 10 GHz to 20 GHz; and the table 3 may be used for 20 GHz or higher.
  • the correspondence between the frequency band and the table may be defined, in advance, within the system by a specification; or may be signaled from the base station 100 to the user equipment 200 using broadcast information, the RRC (Radio Resource Control) signaling, the downlink control information (DCI: Downlink Control Information), etc.
  • RRC Radio Resource Control
  • the base station 100 and the user equipment 200 store the candidates of the PRACH Configuration used for the low frequency band as the table 1, and store the candidates of the PRACH Configuration used for the high frequency band as the table 2.
  • the PRACH Configuration may include one or more of the time/frequency resource position used for the PRACH; the PRACH configuration includes the resource number for each time/frequency; the PRACH configuration may include the spacing between the resources when the plurality of time/frequency resources exists; the subcarrier spacing; the CP length; the preamble sequence length; the preamble sequence pattern; the repetition number of the OFDM symbol; the repetition number of the preamble; and so forth.
  • the PRACH Configuration includes the preamble format. Additionally, an index indicating a pattern of the PRACH Configuration may be included.
  • the base station 100 and the user equipment 200 each select whether the table 1 shown in FIG. 4 is used or the table 2 shown in FIG. 4 is used (S201).
  • the selection of the table may be determined depending on the frequency band in which the user equipment 200 communicates with the base station 100; or the selection of the table may be signaled from the base station 100 to the user equipment 200 as the broadcast information, etc.
  • the UE 1 that communicates in the 4 GHz band uses the table 1
  • the UE 2 that communicates in the 28 GHz band uses the table 2.
  • different formats such as Config a and Config a', may be configured depending on the frequency band; or a same format, such as Config b, may be configured for a plurality of frequency bands.
  • the number of the tables may be optionally configured; and, for example, three or more tables may be used.
  • the correspondence between the frequency band and the table may be optionally configured.
  • three tables may be defined; the table 1 may be used for the range from 2 GHz to 10 GHz; the table 2 may be used for the range from 10 GHz to 20 GHz; and the table 3 may be used for 20 GHz or higher.
  • the correspondence between the frequency band and the table may be signaled from the base station 100 to the user equipment 200 using broadcast information, the RRC (Radio Resource Control) signaling, the downlink control information (DCI: Downlink Control Information), etc.
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the base station 100 determines the preamble format to be used for the random access with the user equipment 200 from the candidates of the preamble format included in the table selected depending on the frequency band, and transmits an indication of the determined preamble format (S203).
  • the base station determines the PRACH Configuration to be used for the random access with the user equipment 200 from the candidates of the PRACH Configuration included in the table selected depending on the frequency band, and transmits the indication of the determined PRACH Configuration (S203).
  • the base station 100 selects the Format a from the table 1 of the preamble format for a UE 1 that communicates in the 4 GHz band; thus, an indication of the Format a is transmitted to the UE 1.
  • the base station 100 may select the Format a' from the table 2 of the preamble format for a UE 2 that communicates in the 28 GHz band; thus, an indication of the Format a is transmitted to the UE 2, instead of the Format a'. Additionally, identical indexes may be attached to the Format a and Format a', and the base station 100 may transmit indications of the preamble formats using the index. Similarly, the base station 100 selects the Config a from the table 1 of the PRACH Configuration for a UE 1 that communicates in the 4 GHz band; thus, an indication of the Config a is transmitted to the UE 1.
  • the base station 100 may select the Config a' from the table 2 of the PRACH Configuration for a UE 2 that communicates in the 28 GHz band; thus, an indication of the Config a may be transmitted to the UE 2, instead of the Config a'. Additionally, identical indexes may be attached to the Config a and the Config a', and the base station 100 may transmit indications of the PRACH Configurations using the index.
  • the PRACH Configuration and the preamble format may be separately signaled, or the PRACH Configuration may include the preamble format.
  • the user equipment 200 starts the random access using the preamble format and/or the PRACH Configuration, from the table selected depending on the frequency band or the table selected by the signaling from the base station, corresponding to the indication (S203) from the base station(S205) .
  • the UE 1 that communicates in the 4 GHz band transmits the preamble using the Format a/the Config a from the table 1 corresponding to the indication of the Format a/the Config a from the base station 100.
  • the UE 2 that communicates in the 28 GHz band transmits the preamble using the Format a'/the Config a' from the table 2 corresponding to the indication of the Format a from the base station 100.
  • the base station 100 transmits the RAR to the user equipment 200, and the communication with the base station 100 is established by transmitting, from the user equipment 200, a connection request to the base station 100.
  • the examples are described in which the tables are defined depending on the frequency band; however, they can be combined into one table for all frequency bands.
  • the base station 100 and the user equipment 200 define candidates of the preamble format and/or candidates of the PRACH Configuration that can be used in a plurality of frequency bands, and store them as one table, for example.
  • a table may be defined that is used depending on the frequency band during testing.
  • the table that is used depending on the frequency band may be defined, in advance, by a specification of the testing within the system.
  • a combination enabling use in all frequency bands (e.g., Format a, Format a', Format b, Format c, Format c', ...) is defined as the preamble formats that can be used between the base station 100 and the user equipment 200.
  • a table appropriate for the 4 GHz band (Format a, Format b, Format c, ...) is defined to be used.
  • a table appropriate for the 28 GHz band (Format a', Format b, Format c', ...) is defined to be used.
  • the table 1 and the table 2 are separately defined; however, the table 1 and the table 2 may not be separately defined, if the information about the frequency bands is included in the table of the combination enabling used in all frequency bands.
  • the base station 100 selects whether the table 1 shown in FIG. 5 is used or the table 2 shown in FIG. 5 is used (S201). Additionally, the user equipment 200 may select whether the table 1 is used or the table 2 is used. The selection of the table may be determined depending on the frequency band in which the user equipment 200 communicates with the base station 100; or may be signaled from the base station 100 to the user equipment 200 as the broadcast information, etc.
  • the base station 100 determines the preamble format and/or the PRACH Configuration to be used for the random access with the user equipment 200 from the candidates of the preamble format and/or the candidates of the PRACH Configuration included in the table selected depending on the frequency band, and transmits an indication of the determined preamble format and/or PRACH Configuration (S203). For example, the base station 100 selects the Format a from the table 1 of the preamble format for a UE 1 that communicates in the 4 GHz band; thus, an indication of the Format a is transmitted to the UE 1. Additionally, the base station 100 selects the Format a' from the table 2 of the preamble format for a UE 2 that communicates in the 28 GHz band; thus, an indication of the Format a' is transmitted to the UE 2.
  • the user equipment 200 starts the random access using the preamble format and/or the PRACH Configuration corresponding to the indication (S203) from the base station (S205). Subsequently, with respect to the random access started by the user equipment 200 using the preamble format and/or the PRACH Configuration indicated to the user equipment 200, the base station 100 transmits the RAR to the user equipment 200, and the user equipment 200 establishes the connection with the base station 100 by transmitting a connection request to the base station 100.
  • FIG. 6 is a diagram illustrating an example of a functional configuration of the base station 100.
  • the base station 100 includes a transmitter 110; a receiver 120; a configuration information manager 130; and a random access controller 140.
  • the names of the functional units used in FIG. 6 are merely examples, and other names may be used.
  • the transmitter 110 is configured to generate a lower layer signal from higher layer information, and to wirelessly transmit the signal.
  • the receiver 120 is configured to wirelessly receive various types of signals, and to retrieve higher layer information from a received signal.
  • the configuration information manager 130 stores configuration information that is configured in advance, and determines and retains the configuration information (preamble format table and/or PRACH Configuration table, preamble format used for random access and/or PRACH Configuration, etc.) to be dynamically and/or semi-statically configured for the user equipment 200.
  • the configuration information manager 130 transfers, to the transmitter 110, the configuration information to be dynamically and/or semi-statically configured for the user equipment 200, and causes the transmitter 110 to transmit the configuration information.
  • the random access controller 140 controls a random access procedure with the user equipment 200.
  • the random access controller 140 attempts to detect a preamble transmitted from the user equipment 200 based on the configuration information. Upon detecting the preamble, the random access controller 140 causes the transmitter 110 to transmit the RAR; and, upon receiving the RRC Connection Request from the user equipment 200, the random access controller 140 causes the transmitter 110 to transmit the RRC Connection Setup.
  • FIG. 7 is a diagram illustrating an example of a functional configuration of the user equipment 200.
  • the user equipment 200 includes a transmitter 210; a receiver 220; a configuration information manager 230; a random access controller 240; and a transmission timing controller 250.
  • the names of the functional units used in FIG. 7 are merely examples, and other names may be used.
  • the transmitter 210 is configured to generate a lower layer signal from higher layer information, and to wirelessly transmit the signal.
  • the receiver 220 is configured to wirelessly receive various types of signals, and to retrieve higher layer information from a received signal.
  • the configuration information manager 230 stores configuration information that is configured in advance, and stores the configuration information (the preamble format table and/or RACH Configuration table, the preamble format used for the random access and/or PRACH Configuration, etc.) to be dynamically and/or semi-statically configured by the base station 100, etc.
  • the random access controller 240 controls a random access procedure with the base station 100.
  • the random access controller 240 causes the transmitter 210 to transmit a preamble in accordance with the preamble format or the PRACH Configuration configured by the base station 100.
  • the random access controller 240 Upon receiving the RAR from the base station 100, the random access controller 240 causes the transmitter 210 to transmit the RRC Connection Request.
  • each functional block may be implemented by a single device that is physically and/or logically connected; or may be implemented by a plurality of devices by directly and/or indirectly connecting (e.g., by a wire line and/or a radio link) two or more devices that are physically and/or logically separated.
  • each of the base station, the user equipment, and so forth according to the embodiment of the present invention may function as a computer for executing the process of the random access method according to the present invention.
  • FIG. 8 is a diagram illustrating an example of a hardware configuration of a radio communication device that is the base station 100 or the user equipment 200 according to the embodiment of the present invention.
  • Each of the above-described base station 100 and the user equipment 200 may be physically configured as a computer device including a processor 1001; a memory 1002; a storage 1003; a communication device 1004; an input device 1005; an output device 1006; a bus 1007, and so forth.
  • each of the base station 100 and the user equipment 200 may be configured to include one or a plurality of devices illustrated in the drawings; or may be configured not to include a part of the devices.
  • each function of the base station 100 and the user equipment 200 can be implemented by the processor 1001 by operating to control the communication by the communication device 1004 and/or reading out data and/or writing data in the memory 1002 and the storage 1003.
  • the processor 1001 operates the operating system to control the entire computer.
  • the processor 1001 may be formed of a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device; a control device; a processor; a register; and so forth.
  • CPU Central Processing Unit
  • the transmitter 110, the receiver 120, the configuration information manager 130, and the random access controller 140 of the above-described base station 100, or the transmitter 210, the receiver 220, the configuration information manager 230, the random access controller 240, and the transmission timing controller 250 of the user equipment 200 may be implemented by the processor 1001.
  • the processor 1001 reads out a program (program code), a software module, and/or data from the storage 1003 and/or the communication device 1004 onto the memory 1002, and executes various processes in accordance with these.
  • a program program code
  • a software module software module
  • data data from the storage 1003 and/or the communication device 1004 onto the memory 1002, and executes various processes in accordance with these.
  • a program may be used that causes a computer to execute at least a part of the operation described in the above-described embodiment.
  • the transmitter 110, the receiver 120, the configuration information manager 130, and the random access controller 140 of the above-described base station 100, or the transmitter 210, the receiver 220, the configuration information manager 230, the random access controller 240, and the transmission timing controller 250 of the user equipment 200 may be implemented by a control program that is stored in the memory 1002 and operated by the processor 1001; and, similarly, other functional blocks may be implemented. It is described that each of the above-described processes is executed by the single processor 1001; however, it can be simultaneously or sequentially executed by two or more processors 1001.
  • the processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from a network through an electric telecommunication line.
  • the memory 1002 may be a computer readable recording medium, and may be formed of, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), and so forth.
  • the memory 1002 may be referred to as a register, a cache, a main memory (main memory device), and so forth.
  • the memory 1002 can store a program (program code), a software module, and so forth that can be executed to implement the random access method according to the embodiment of the present invention.
  • the storage 1003 is a computer readable recording medium, and may be formed of, for example, at least one of an optical disk, such as a CD-ROM (Compact Disc ROM); a hard disk drive; a flexible disk; a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and so forth.
  • the storage 1003 may be referred to as an auxiliary storage device.
  • the above-described storage medium may be, for example, a database including the memory 1002 and/or the storage 1003, a server, or another appropriate medium.
  • the communication device 1004 is hardware (transceiver device) for executing communication between computers through a wired network and/or a wireless network; and, for example, the communication device 1004 may also be referred to as a network device, a network controller, a network card, a communication module, and so forth.
  • the communication device 1004 may also be referred to as a network device, a network controller, a network card, a communication module, and so forth.
  • each of the above-described transmitter 110, the receiver 120, the transmitter 210, the receiver 220, and so forth may be implemented by the communication device 1004.
  • the input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) for receiving an input from the outside.
  • the output device 1006 is an output device (e.g., a display, a speaker, a LED lamp, etc.) for providing output to the outside.
  • the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).
  • each of the devices is connected by a bus 1007 for communicating information.
  • the bus 1007 may be formed of a single bus, or may be formed of buses that differ depending on a pair of devices.
  • each of the base station 100 and the user equipment 200 may be formed to include hardware, such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and a FPGA (Field Programmable Gate Array); and a part or all of the respective functional blocks may be implemented by the hardware.
  • the processor 1001 may be implemented by at least one of these hardware components.
  • the overhead for signaling the random access parameter can be reduced or the testing can be reduced. For example, by storing the candidates of the parameter in a table format, etc., depending on the frequency band, and by selecting a table to be referred to depending on the frequency band, the overhead for signaling the random access parameter can be reduced, and the testing can be reduced.
  • the signaling from the base station to the user equipment for selection of the table can be omitted, and the amount of the signaling can be reduced.
  • the overhead for signaling can be reduced by including the preamble format in the PRACH Configuration.
  • LTE long term evolution
  • LTE-A LTE-advanced
  • SUPER 3G IMT-Advanced
  • 4G 5G
  • FRA flight radio
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB ultra mobile broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 UWB (ultra-wideband)
  • Bluetooth registered trademark
  • system and "network” used in this specification are interchangeably used.
  • the specific operation that is described in this specification to be performed by the base station may be performed by an upper node of the base station in some cases.
  • a network formed of one or more network nodes that includes a base station it is clear that various operations to be performed for communication with a terminal can be performed by the base station and/or another network node other than the base station (for example, the MME or the S-GW can be considered; however, it is not limited to these).
  • the case is exemplified where there is one network node other than the base station; however, a combination of a plurality of other network nodes (e.g., the MME and the S-GW) may be used.
  • Information can be output from an upper layer (or lower layer) to a lower layer (upper layer).
  • Input/output may be executed through a plurality of networks.
  • the input/output information, etc. may be stored in a specific location (e.g., a memory); or may be maintained by a management table.
  • the input/output information, etc. may be overwritten, updated, or appended.
  • the output information, etc. may be deleted.
  • the input information, etc. may be transmitted to another device.
  • Notification of information is not limited to the aspect/embodiment described in the present specification, and may be performed by other methods.
  • notification of information may be performed via physical layer signaling (for example, DCI (Downlink Control Information) or UCI (Uplink Control Information)); upper-layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), or SIB (System Information Block)); other signals, or by a combination thereof.
  • RRC signaling may be referred to as an RRC message; and the RRC signaling may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, and so forth.
  • Determination may be made by a value represented by one bit (0 or 1); may be made by a Boolean value (Boolean: true or false); or may be made by comparison of numerical values (comparison with a predetermined value, for example).
  • the software should be interpreted broadly so as to imply a command, a command set, a code, a code segment, a program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a subroutine, an object, an executable file, an execution thread, a procedure, a function, and so forth.
  • software, a command, and so forth may be transmitted and received through a transmission medium.
  • a transmission medium such as a coaxial cable, an optical fiber cable, a twisted pair, and a digital subscriber line (DSL), and/or wireless technology, such as infrared, radio, and microwave
  • wired technology and/or wireless technology is included within the definition of the transmission medium.
  • Information, signals, etc., described in the present specification may be represented using any of various other techniques.
  • data, instructions, commands, information, signals, bits, symbols, chips, and so forth, which may be described in the entire description may be represented by voltage, current, electromagnetic waves, magnetic field or magnetic particles, optical field or photons, or any combination thereof.
  • the channel and/or symbol may be signaling (signal).
  • a signal may be a message.
  • a component carrier (CC) may be referred to as a carrier frequency, a cell, and so forth.
  • the information, parameters, and so forth, which are described in the specification may be represented by absolute values; may be represented as relative values from predetermined values; or may be represented by any other corresponding information.
  • the radio resource may be indicated by an index.
  • the names used for the above-described parameters should not be interpreted restrictively in any way.
  • mathematical expressions, etc., using these parameters may be different from the mathematical expressions explicitly disclosed in this specification.
  • the various channels (e.g., PUCCH, PDCCH, etc.) and information elements (e.g., TPC) can be identified by any suitable name.
  • the various names assigned to the various channels and information elements should not be interpreted restrictively in any way.
  • determining and “deciding” used in this specification may include various types of operations. For example, “determining” and “deciding” may include deeming that a result of calculating, computing, processing, deriving, investigating, looking up (e.g., search in a table, a database, or another data structure), or ascertaining is determined or decided. Furthermore, “determining” and “deciding” may include, for example, deeming that a result of receiving (e.g., reception of information), transmitting (e.g., transmission of information), input, output, or accessing (e.g., accessing data in memory) is determined or decided. Furthermore, “determining” and “deciding” may include deeming that a result of resolving, selecting, choosing, establishing, or comparing is determined or decided. Namely, "determining” and “deciding” may include deeming that some operation is determined or decided.
  • any reference to elements using names, such as "first” and “second,” which are used in this specification, does not generally limit the quantity or order of these elements. These names are used in the specification as a convenient method for distinguishing two or more elements. Accordingly, the reference to the first and second elements does not imply that only the two elements can be adopted here, or does not imply that the first element must precede the second element in any way.
  • notification of predetermined information is not limited to notification that is made explicitly; and the notification may be made implicitly (e.g., notification of the predetermined information is not performed).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (7)

  1. Terminal (200) comprenant :
    un récepteur (220) apte à recevoir un indice indiquant des informations de configuration pour configurer une ressource à utiliser pour un accès aléatoire depuis une station de base ;
    un dispositif de commande (240) apte à sélectionner l'un parmi un premier groupe de candidats et un second groupe de candidats sur la base d'une bande de fréquence, dans lequel le premier groupe de candidats et le second groupe de candidats incluent un candidat pour une ressource et un format de préambule à utiliser pour un accès aléatoire ; et
    un émetteur (210) apte à transmettre un préambule en utilisant un format de préambule correspondant à l'indice dans le groupe de candidats sélectionné dans une ressource correspondant à l'indice dans le groupe de candidats sélectionné,
    dans lequel chacun du premier groupe de candidats et du second groupe de candidats inclut en outre, pour chaque indice, un paramètre relatif à un nombre de ressources temporelles du canal physique à accès aléatoire, PRACH.
  2. Terminal (200) selon la revendication 1, dans lequel chacun du premier groupe de candidats et du second groupe de candidats inclut en outre, pour chaque indice, au moins l'un de ce qui suit :
    un paramètre indiquant un numéro de répétitions de symboles OFDM ; et
    un paramètre indiquant une position temporelle d'une ressource à utiliser pour un accès aléatoire.
  3. Terminal (200) selon la revendication 1 ou 2,
    dans lequel au moins certains de formats de préambule inclus dans le premier groupe de candidats sont différents de formats de préambule inclus dans le second groupe de candidats.
  4. Terminal selon l'une quelconque des revendications 1 à 3,
    dans lequel un format de préambule correspondant à un indice dans le premier groupe de candidats est différent d'un format de préambule correspondant à l'indice dans le second groupe de candidats.
  5. Procédé de transmission de préambule d'un terminal, le procédé de transmission de préambule comprenant :
    la réception (S203) d'un indice indiquant des informations de configuration pour configurer une ressource à utiliser pour un accès aléatoire depuis une station de base ;
    la sélection (S201) de l'un parmi un premier groupe de candidats et un second groupe de candidats sur la base d'une bande de fréquence, dans lequel le premier groupe de candidats et le second groupe de candidats incluent un candidat pour une ressource et un format de préambule à utiliser pour un accès aléatoire ; et
    la transmission (S205) d'un préambule en utilisant un format de préambule correspondant à l'indice dans le groupe de candidats sélectionné dans une ressource correspondant à l'indice dans le groupe de candidats sélectionné,
    dans lequel chacun du premier groupe de candidats et du second groupe de candidats inclut en outre, pour chaque indice, un paramètre relatif à un nombre de ressources temporelles du canal physique à accès aléatoire, PRACH.
  6. Station de base comprenant :
    un émetteur (110) apte à transmettre un indice indiquant des informations de configuration pour configurer une ressource à utiliser pour un accès aléatoire à un terminal ;
    un dispositif de commande (140) apte à sélectionner l'un parmi un premier groupe de candidats et un second groupe de candidats sur la base d'une bande de fréquence, dans laquelle le premier groupe de candidats et le second groupe de candidats incluent un candidat pour une ressource et un format de préambule à utiliser pour un accès aléatoire ; et
    un récepteur (120) apte à recevoir un préambule qui est à transmettre en utilisant un format de préambule correspondant à l'indice dans le groupe de candidats sélectionné dans une ressource correspondant à l'indice dans le groupe de candidats sélectionné,
    dans lequel chacun du premier groupe de candidats et du second groupe de candidats inclut en outre, pour chaque indice, un paramètre relatif à un nombre de ressources temporelles du canal physique à accès aléatoire, PRACH.
  7. Système de communication radio comprenant :
    un terminal (200) comprenant :
    un récepteur (220) apte à recevoir un indice indiquant des informations de configuration pour configurer une ressource à utiliser pour un accès aléatoire depuis une station de base ;
    un dispositif de commande (240) apte à sélectionner l'un parmi un premier groupe de candidats et un second groupe de candidats sur la base d'une bande de fréquence, dans lequel le premier groupe de candidats et le second groupe de candidats incluent un candidat pour une ressource et un format de préambule à utiliser pour un accès aléatoire ; et
    un émetteur (210) apte à transmettre un préambule en utilisant un format de préambule correspondant à l'indice dans le groupe de candidats sélectionné dans une ressource correspondant à l'indice dans le groupe de candidats sélectionné ; et
    une station de base comprenant :
    un émetteur (110) apte à transmettre l'indice indiquant des informations de configuration pour configurer une ressource à utiliser pour un accès aléatoire au terminal ;
    un dispositif de commande (140) apte à sélectionner l'un parmi le premier groupe de candidats et le second groupe de candidats sur la base de la bande de fréquence, dans laquelle le premier groupe de candidats et le second groupe de candidats incluent un candidat pour une ressource et un format de préambule à utiliser pour un accès aléatoire ; et
    un récepteur (120) apte à recevoir un préambule qui est à transmettre en utilisant un format de préambule correspondant à l'indice dans le groupe de candidats sélectionné dans une ressource correspondant à l'indice dans le groupe de candidats sélectionné,
    dans lequel chacun du premier groupe de candidats et du second groupe de candidats inclut en outre, pour chaque indice, un paramètre relatif à un nombre de ressources temporelles du canal physique à accès aléatoire, PRACH.
EP22159352.8A 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire Active EP4030859B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL22159352.8T PL4030859T3 (pl) 2017-05-02 2017-05-02 Sprzęt użytkownika, stacja bazowa i sposób dostępu losowego
EP22159352.8A EP4030859B1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire
ES22159352T ES2964129T3 (es) 2017-05-02 2017-05-02 Equipo de usuario, estación base y método de acceso aleatorio
EP23192929.0A EP4258738A3 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP17908417.3A EP3621347B1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire
PCT/JP2017/017310 WO2018203411A1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base et procédé d'accès aléatoire
EP22159352.8A EP4030859B1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire

Related Parent Applications (1)

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EP17908417.3A Division EP3621347B1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP23192929.0A Division-Into EP4258738A3 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire
EP23192929.0A Division EP4258738A3 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire

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EP4030859A1 EP4030859A1 (fr) 2022-07-20
EP4030859B1 true EP4030859B1 (fr) 2023-10-04

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EP23192929.0A Pending EP4258738A3 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire
EP17908417.3A Active EP3621347B1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire
EP22159352.8A Active EP4030859B1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire

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EP17908417.3A Active EP3621347B1 (fr) 2017-05-02 2017-05-02 Dispositif d'utilisateur, station de base, et procédé d'accès aléatoire

Country Status (11)

Country Link
US (1) US11219068B2 (fr)
EP (3) EP4258738A3 (fr)
JP (1) JP6761542B2 (fr)
CN (1) CN110574422B (fr)
AU (1) AU2017412687B2 (fr)
BR (1) BR112019022699A2 (fr)
ES (1) ES2964129T3 (fr)
MX (1) MX2019012933A (fr)
PL (1) PL4030859T3 (fr)
PT (1) PT3621347T (fr)
WO (1) WO2018203411A1 (fr)

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US11528749B2 (en) * 2017-06-08 2022-12-13 Qualcomm Incorporated Techniques and apparatuses for random access procedure in a wireless backhaul network
US11419143B2 (en) * 2017-06-08 2022-08-16 Qualcomm Incorporated Random access procedure in a wireless backhaul network
US11343666B2 (en) * 2018-02-13 2022-05-24 Qualcomm Incorporated Waveform design of discovery signals
US11044760B2 (en) * 2018-05-08 2021-06-22 FG Innovation Company Limited Methods and related devices for transmitting identification information of user equipment during random access procedure
WO2021161481A1 (fr) * 2020-02-13 2021-08-19 株式会社Ｎｔｔドコモ Terminal
US20240014988A1 (en) * 2020-11-20 2024-01-11 Ntt Docomo, Inc. Terminal

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EP2225907B1 (fr) 2007-12-12 2011-10-12 Telefonaktiebolaget L M Ericsson (publ) Configuration d'accès aléatoire etendue transmise par une station de base d'un réseau e-utran pour l'accès aléatoire à un canal radio par un terminal d'abonné
WO2009078785A1 (fr) * 2007-12-14 2009-06-25 Telefonaktiebolaget L M Ericsson (Publ) Procedes et dispositifs de communication sur un canal radio
KR101519345B1 (ko) 2008-01-01 2015-05-21 주식회사 팬택 랜덤 액세스 요청 송수신 및 랜덤 액세스 응답 송수신 방법
KR101548748B1 (ko) * 2008-08-07 2015-09-11 엘지전자 주식회사 랜덤 접속 절차를 수행하는 방법
EP3180955B1 (fr) * 2014-08-15 2019-08-14 Interdigital Patent Holdings, Inc. Prise en charge de procédures d'accès aléatoire et de radiomessagerie pour wtru à capacité réduite dans un système lte
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US10631330B2 (en) * 2015-04-03 2020-04-21 Qualcomm Incorporated Random access procedures under coverage limitations
TWI765881B (zh) * 2016-03-30 2022-06-01 美商Ｉｄａｃ控股公司 無線傳輸/接收單元（ｗｔｒｕ）及其執行方法
US20180220450A1 (en) * 2017-02-02 2018-08-02 Sharp Laboratories Of America, Inc. User equipments, base stations and methods
EP3474624B1 (fr) * 2017-03-20 2020-08-26 ASUSTek Computer Inc. Procédé et appareil pour une procédure d'accès aléatoire d'une demande d'informations système dans un système de communication sans fil

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BR112019022699A2 (pt) 2020-05-19
WO2018203411A1 (fr) 2018-11-08
JP6761542B2 (ja) 2020-09-23
CN110574422A (zh) 2019-12-13
ES2964129T3 (es) 2024-04-04
AU2017412687B2 (en) 2021-01-07
PL4030859T3 (pl) 2024-01-22
PT3621347T (pt) 2022-03-18
EP3621347A1 (fr) 2020-03-11
EP4030859A1 (fr) 2022-07-20
EP4258738A3 (fr) 2024-01-17
MX2019012933A (es) 2020-02-03
CN110574422B (zh) 2023-12-05
JPWO2018203411A1 (ja) 2020-03-12
US11219068B2 (en) 2022-01-04
EP4258738A2 (fr) 2023-10-11
EP3621347B1 (fr) 2022-03-02
EP3621347A4 (fr) 2020-11-04
AU2017412687A1 (en) 2019-12-19
US20200154484A1 (en) 2020-05-14

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